webrtcsink: fix RFC7273 attributes

RFC7273 related attributes are set in the SDP offer by passing them via the transceiver codec-preferences signal. These attributes are intended to be set at the media level so they must be prefixed by a- in the Caps argument to the signal. Otherwise they end up under a=fmtp.

assigned to @gstreamer-merge-bot

added 0.13 Needs backport labels

mentioned in commit fengalin/gst-plugins-rs@f532d523

added 4 commits

• 44b82f39...b5586095 - 3 commits from branch gstreamer:main
• f532d523 - webrtcsink: fix RFC7273 attributes

Compare with previous version

merged

changed milestone to %0.14.0

mentioned in commit gstreamer-backport-bot/gst-plugins-rs@8d6e8baa

added Backported into 0.13 label and removed Needs backport label

Merge Request for backport into 0.13 branch: !1811 (merged) (target milestone: 0.13.2)

mentioned in merge request !1811 (merged)